How did you force feed it, and how long did it go without eating that you thought it would be a good idea to force feed it? What did you try before force feeding?
With such a big tank, you will need a second thermostat and a way to heat the cool side, being that your cool side drops down to the 70s. A lot of the issues you are running into are from having a 55 gallon glass tank. You will be a lot better off using smaller plastic tubs, but I'm sure you know that since you read the care threads here. If you insist on sticking with the 55g aquarium, you will need to buy a lot more stuff to get the basic husbandry right. You know what you need to do for the most part, so either use smaller plastic tubs or go buy all the stuff you will need to get it right in the 55g.
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